From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 549CCC433B4 for ; Fri, 9 Apr 2021 19:11:21 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id BFAC66115B for ; Fri, 9 Apr 2021 19:11:20 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BFAC66115B Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 4C58F6B006C; Fri, 9 Apr 2021 15:11:20 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 475E76B006E; Fri, 9 Apr 2021 15:11:20 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 316706B0070; Fri, 9 Apr 2021 15:11:20 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0111.hostedemail.com [216.40.44.111]) by kanga.kvack.org (Postfix) with ESMTP id 10F906B006C for ; Fri, 9 Apr 2021 15:11:20 -0400 (EDT) Received: from smtpin02.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id B47551F1B for ; Fri, 9 Apr 2021 19:11:19 +0000 (UTC) X-FDA: 78013771878.02.E9DB379 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf26.hostedemail.com (Postfix) with ESMTP id 3FCAF40002DA for ; Fri, 9 Apr 2021 19:11:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=c6bF0o530sEFfUOMYKiuz98B39kHRlFATNnIYOB0g+s=; b=NLy3Kc8IJA0Z9nJex8rikMcRPq kFaBIqGGoW0m2L0+vR03kv6LYIgM0CUtRY/idHgu8/gEnMXHYGhyPIAQfTvk7m4RQg6lERJZauk3c JmlkoPe6pffNiyAV6WRxA+AA1/reFta1fkrDzqqwG05sNCFL7kyNiUmA0yXEl6uABbp8Vzgw/EajQ mi1x6GEocmC78mAXCVgs4G9bjXdmXqM5lUD65wv8pEkyXzBAliZeOyzVIluQZQyIumgn538n8RpPc YVypm1imLLt+HUpsBy8pV3QFa37S9czp9BtcTVwadTFdQ7mU6Xe/gB3yF4ri7/ZojIhUhxyc7DTrB TbmRVOuw==; Received: from willy by casper.infradead.org with local (Exim 4.94 #2 (Red Hat Linux)) id 1lUwVY-000oZV-25; Fri, 09 Apr 2021 19:09:48 +0000 From: "Matthew Wilcox (Oracle)" To: linux-mm@kvack.org Cc: "Matthew Wilcox (Oracle)" , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-cachefs@redhat.com, linux-afs@lists.infradead.org, Christoph Hellwig , Jeff Layton Subject: [PATCH v7 25/28] mm/writeback: Add wait_for_stable_folio Date: Fri, 9 Apr 2021 19:51:02 +0100 Message-Id: <20210409185105.188284-26-willy@infradead.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210409185105.188284-1-willy@infradead.org> References: <20210409185105.188284-1-willy@infradead.org> MIME-Version: 1.0 X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 3FCAF40002DA X-Stat-Signature: o3ucgpa1uad918f1fq8gy9ksg7sse4ni Received-SPF: none (infradead.org>: No applicable sender policy available) receiver=imf26; identity=mailfrom; envelope-from=""; helo=casper.infradead.org; client-ip=90.155.50.34 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1617995476-398788 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Move wait_for_stable_page() into the folio compatibility file. wait_for_stable_folio() avoids a call to compound_head() and is 14 bytes smaller than wait_for_stable_page() was. The net text size grows by 24 bytes as a result of this patch. Signed-off-by: Matthew Wilcox (Oracle) Reviewed-by: Christoph Hellwig Acked-by: Jeff Layton --- include/linux/pagemap.h | 1 + mm/folio-compat.c | 6 ++++++ mm/page-writeback.c | 24 ++++++++++++++---------- 3 files changed, 21 insertions(+), 10 deletions(-) diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index 99331c35c89c..d50fc5adbee1 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -833,6 +833,7 @@ int wait_on_folio_writeback_killable(struct folio *fo= lio); void end_page_writeback(struct page *page); void end_folio_writeback(struct folio *folio); void wait_for_stable_page(struct page *page); +void wait_for_stable_folio(struct folio *folio); =20 void page_endio(struct page *page, bool is_write, int err); =20 diff --git a/mm/folio-compat.c b/mm/folio-compat.c index 6aadecc39fba..335594fe414e 100644 --- a/mm/folio-compat.c +++ b/mm/folio-compat.c @@ -29,3 +29,9 @@ void wait_on_page_writeback(struct page *page) return wait_on_folio_writeback(page_folio(page)); } EXPORT_SYMBOL_GPL(wait_on_page_writeback); + +void wait_for_stable_page(struct page *page) +{ + return wait_for_stable_folio(page_folio(page)); +} +EXPORT_SYMBOL_GPL(wait_for_stable_page); diff --git a/mm/page-writeback.c b/mm/page-writeback.c index 8271f9b24b69..9d55ceec05c0 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -2865,17 +2865,21 @@ int wait_on_folio_writeback_killable(struct folio= *folio) EXPORT_SYMBOL_GPL(wait_on_folio_writeback_killable); =20 /** - * wait_for_stable_page() - wait for writeback to finish, if necessary. - * @page: The page to wait on. + * wait_for_stable_folio() - wait for writeback to finish, if necessary. + * @folio: The folio to wait on. * - * This function determines if the given page is related to a backing de= vice - * that requires page contents to be held stable during writeback. If s= o, then - * it will wait for any pending writeback to complete. + * This function determines if the given folio is related to a backing + * device that requires folio contents to be held stable during writebac= k. + * If so, then it will wait for any pending writeback to complete. + * + * Context: Sleeps. Must be called in process context and with + * no spinlocks held. Caller should hold a reference on the folio. + * If the folio is not locked, writeback may start again after writeback + * has finished. */ -void wait_for_stable_page(struct page *page) +void wait_for_stable_folio(struct folio *folio) { - page =3D thp_head(page); - if (page->mapping->host->i_sb->s_iflags & SB_I_STABLE_WRITES) - wait_on_page_writeback(page); + if (folio->mapping->host->i_sb->s_iflags & SB_I_STABLE_WRITES) + wait_on_folio_writeback(folio); } -EXPORT_SYMBOL_GPL(wait_for_stable_page); +EXPORT_SYMBOL_GPL(wait_for_stable_folio); --=20 2.30.2